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• In Java, is a Comparator used in Collections.sort() thread safe?

  - by evan

  If I create a single instance of a Comparator, can that instance be used across multiple threads to sort collections using Collections.sort()? Or, do I need to create a new instance of the Comparator for each call to Collections.sort() to ensure thread safety?

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• Open source tool for hosting projects similar to "Google Project Hosting"

  - by Jeesmon

  We are looking for open source tool for hosting our internal projects like "Google Project Hosting". The tool should support individual wiki and version control for each project and it should be easy to configure for each project like in google code. We explored trac but seems it lack good support for multiple projects. The tool will be installed in our internal host and cannot use hosted service. A java based tool will be ideal.

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• Which database and language is better at handling Unicode?

  - by user187809

  which database should I use, if my application is going to be in multiple languages (including Chinese, Japanese etc)? In other words, is MySQL better or worse than Postgres to handle unicode etc? (these are the only two databases my hosting company has) Also, which language is better for handling unicode? PHP or Ruby/Rails?

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• Storing dynamic fields in Django forms

  - by hekevintran

  Django's form library has a feature of form sets that allow you to process dynamically added forms. For example you would use form sets if your application has a list of bookmarks you could use form sets to process multiple forms that each represent a bookmark. What about if you want to dynamically add a field to a form? An example would be a survey creation page where you can dynamically add an unlimited number of questions. How do you handle this in Django?

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• Which type of design pattern should be used to create an emulator?

  - by Facon

  I have programmed an emulator, but I have some doubts about how to organizate it properly, because, I see that it has some problems about classes connection (CPU <- Machine Board). For example: I/O ports, interruptions, communication between two or more CPU, etc. I need for the emulator to has the best performance and good understanding of the code. PD: Sorry for my bad English. EDITED: Asking for multiple patterns.

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• UItableView Problem in deleting items from database

  - by Arun Sharma

  Hi All, I am using in UitableView database.My table view works successfully (add single item,add multiple item,delete all) only problem is there when i want to delete single item for this i using Uitableview edit option. so how i add database method for deleting single item from database and also from table view. Please help me.

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• Is there an open source UITabbedView component available for the iPhone (iPad) SDK?

  - by smountcastle

  Is there an open source UIView component that supports multiple, dynamic tabbed views for the iPhone (iPad) SDK? I see several apps in the iPad App Store which utilize tabs, one such example is the Atomic Web Browser which provides a tabbed browsing experience (like Safari on the Mac or Firefox). Instead of reinventing this functionality, I'd like to reuse an existing component.

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• How to implement "select all" check box in HTML?

  - by m.mahesh2000

  I have an HTML page with multiple checkboxes. I need one more checkbox by the name "select all". When I select this checkbox all checkboxes in the HTML page must be selected. How can I do this?

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• XHTML 1.0 Transitive, is there a tool that can refactor HTML?

  - by GenEric35

  I have a Asp.net web application running with the following config setting. <xhtmlConformance mode="Legacy"/> This limits use of AJAX and compatibility with multiple browser. If my understanding is correct, the HTML code of the aspx pages need to be fixed to comply with XHTML 1.0 Transitional. There are alot of HTML pages, ~1000, is there a tool that could speed up this process?

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• Getting $_POST variable from table

  - by Sakamoto Kazuma

  I'm trying to build a sort of resource allocation form. I'd like to be able to print a table from a database, and then allow users to click on each cell that they would like to reserve. Also, being able to drag and select multiple cells. Then send all of this via $_POST to another php script. Problem is, I have no idea where to start. Any suggestions?

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• Reset Particular Input Element in a HTML Form

  - by SKR

  I have multiple input textboxes in my page. I want to reset particular text box to its onload state if certain conditions fails. I am considering using a Hidden element to store the onload state of the textbox. I would other suggestions or solutions to resolve this issue.

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• Changing Image In an ImageButton After Being Clicked?

  - by BuZzZzJaY

  Creating a game in Android using multiple ImageButtons to display an image from the drawable folder and I want to change the button to a different image after the button has been clicked on. Here is the code for my image button: <ImageButton android:id="@+id/b56" android:layout_width="45px" android:layout_height="45px" android:layout_gravity="center_vertical" android:src="@drawable/black" /> I can't find anything about how to change the actual image of the button. You can change the color of the button by using the following code in the java file: b32.setBackgroundColor(0xAA00AA00);

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• Does it make sense to fragment cache static partials

  - by ash34

  Hi, I have my views and layouts split into multiple partials, some of them are static partials i.e, no data from the database being displayed here. Does it make sense to cache these to prevent the erb templating system from generating the html each time or it only makes sense to cache in situations where something needs to be retrieved from the db each time. thanks, ash

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• Running Maven Goals in CLI.

  - by Jeeyoung Kim

  Hello, I have a maven pom.xml file with multiple instances of a same goal defined (inside with different s). I'm wondering how I can run a specific goal via maven command line. I've tried mvn --help, but I couldn't find an entry regarding this.

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• Sanitizing MySQL user parameters.

  - by Tom

  What are the dangerous characters that should be replaced in user input when the users' input will be inserted in a MySQL query? I know about quotes, double quotes, \r and \n. Are there others?(I don't have the option of using a smart connector that accepts parameters so I have to build the query myself and this will be implemented in multiple programming languages, including some obscure ones so solutions such as mysql_real_escape_string in PHP are not valid)

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• Are event handlers in JavaScript called in order?

  - by musicfreak

  I know this is a simple question, but I haven't had the chance to test it in any browser other than Firefox. If I attach multiple event handlers to a single event on a single DOM element, are the event handlers guaranteed to be called in the order they were added? Or should I not rely on this behavior?

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• How to avoid keyboard hide & show when focus changes from UITextField and UIWebView?

  - by Manoj

  I have a requirement in which the view contains one native UITextField and one UIWebView. The issue is if I switch the focus from UITextView to UIWebView, the keyboard window flicker(hides and then shows). ie, I got UIKeyboardWillHideNotification and UIKeyboardDidShowNotification But, this is not happening when I switch the other way. ies, I got only UIKeyboardDidShowNotification Is there any way to avoid this flickering effect? Note: I also notices if I have multiple UITextField and UIWebView, this issue is not happening with the same type of views.

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• MultiOS "Jet Database" for C++/Qt?

  - by Airjoe

  Hopefully I can articulate this well: I'm porting an application I made years ago from VB6 (I know, I know!) to C++/Qt. In my original application, one thing I liked was that I didn't need an actual SQL server running, I could just use MS Access .mdb files. I was wondering if something similar exists for Qt that will work on multiple OSes - a database stored in a file, pretty much, but that I can still run SQL queries with. Not sure if something like this exists or not, but any help appreciated, thanks!

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• Django Model: many-to-many or many-to-one?

  - by knuckfubuck

  I'm just learning django and following a tutorial. I have a Link and a Bookmark. Unlike the tutorial I'm following, I would like a link to be associated with only one Bookmark, but a Bookmark can have multiple links. Is this the way to setup the model? class Link(models.Model): url = models.URLField(unique=True) bookmark = models.ForeignKey(Bookmark) class Bookmark(models.Model): title = models.CharField(maxlength=200) user = models.ForeignKey(User) links = models.ManyToManyField(Link)

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• MySQL count elements in a database based on how many unique values there are in a field.

  - by 0plus1

  (Sorry for the title, I don't really know how to phrase that :-) ) I have a table that has a date and a uid fields. I need to get the number of uid for each date, currently I'm doing it in php running multiple queries like this one: SELECT COUNT(uid) FROM users where Date = 'xxx'; Is there a simple way to achieve this with only an sql query?

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• Scalable chat site in python

  - by user346572

  Hey guys, I have an idea that I'd like to start implementing that at the crux of it, will basically be a chat website, and will need to support multiple rooms. Quite frankly, I'm not too sure where to begin with regards to setting up a very sturdy/scalable chat system in python (or another language if you guys believe it to be a better alternative), so any suggestions that can get me pointed in the right direction will be greatly appreciated.

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• Efficient way to store tuples in the datastore

  - by Drew Sears

  If I have a pair of floats, is it any more efficient (computationally or storage-wise) to store them as a GeoPtProperty than it would be pickle the tuple and store it as a BlobProperty? If GeoPt is doing something more clever to keep multiple values in a single property, can it be leveraged for arbitrary data? Can I store the tuple ("Johnny", 5) in a single entity property in a similarly efficient manner?

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• Constructor within a constructor

  - by Chiramisu

  Is this a bad idea? Does calling a generic private constructor within a public constructor create multiple instances, or is this a valid way of initializing class variables? Private Class MyClass Dim _msg As String Sub New(ByVal name As String) Me.New() 'Do stuff End Sub Sub New(ByVal name As String, ByVal age As Integer) Me.New() 'Do stuff End Sub Private Sub New() 'Initializer constructor Me._msg = "Hello StackOverflow" 'Initialize other variables End Sub End Class

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• Spring scheduled tasks

  - by stackuser

  I'm trying to use spring scheduled tasks for my scheduled jobs, I have one scheduler configured for multiple tasks executors as below <task:scheduled-tasks scheduler="ABCTaskScheduler"> <task:scheduled ref="ABCTaskExecutor" method="execute" cron="some_expression_1" /> <task:scheduled ref="DEFTaskExecutor" method="execute" cron="some_expression_1" /> </task:scheduled-tasks> My question in how can I make the task executor list dynamic, so that I do not have to change my spring config each time I have to add a new task executor.

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• How do I tag files in a directory in a SVN repository with a global version number that will appear

  - by mithaldu

  I am working on a project that stores multiple versions in the same svn repo but in different directories. For ease of reference for the coders working on the project I'd like to be able to add a commented tag similarly to # $Revision: 144 $ However, instead of the file revision it should contain a simple version number like so: # $Version: 1.63 $ # $Version: 1.64 $ # $Version: 2.0 $ Is there a way to get subversion to do this automatically for a specific directory and all sub-directories as well as for any new files added to those?

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